ASTM F1685-00

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An American National Standard
Designation: F 1685 – 00
Standard Specification for
Pressure-Reducing Manifolds for Air or Nitrogen Systems
This standard is issued under the fixed designation F 1685; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope Naval Sea Systems Command (NAVSEA):
NAVSEA803-1385884 Unions, Fittings and Adapters Butt
1.1 This specification covers the design, construction, test-
and Socket Welding 6000 PSI, WOG and OXY (IPS)
ing and operating requirements for pressure-reducing mani-
NAVSEA803-1385943 Unions, Silver Brazing 3000 PSI,
folds for air or nitrogen systems, referred to herein also as
WOG, IPS, for UT Inspection
manifolds. The term manifold constitutes the combination of
NAVSEA803-1385946 Unions, Bronze, Silver Brazing,
all components and piping between, and including, the inlet
WOG for UT Inspection, 1500 PSI, WOG
and outlet ports (see Fig. 1 and Fig. 2).
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
3. Terminology
as the standard. The values given in parentheses (metric SI
3.1 Definitions:
units) are for information only.
3.1.1 accuracy of regulation—the amount by which the
2. Referenced Documents downstreampressuremayvarywhenthemanifoldissetatany
pressurewithintherequiredsetpressurerangeandissubjected
2.1 ASTM Standards:
to any combination of inlet pressure, flow demand, and
F992 Specification for Valve Label Plates
ambient temperature variations within the specified limits.
F1508 SpecificationforAngleStyle,PressureReliefValves
3.1.2 bubble-tight—No visible leakage over a 5-min period
for Steam, Gas, and Liquid Services
usingeitherwatersubmersionortheapplicationofbubblefluid
F1795 Specification for Pressure-Reducing Valves for Air
for detection.
or Nitrogen Systems
3.1.3 external leakage—Leakage from the manifold which
2.2 American Society of Mechanical Engineers (ASME):
escapes to atmosphere.
B1.1 UnifiedScrew Threads
3.1.4 flow rate demand—the amount of flow demanded at
2.3 Military Standards and Specifications:
any given time by the system downstream of the manifold.
MIL-STD-167-1 Mechanical Vibrations of Shipboard
3.1.5 flow rate demand range—the range over which the
Equipment (Type I—Environmental and Type II— Inter-
flow demand can vary.
nally Excited)
3.1.6 hydrostatic shell test pressures—the hydrostatic test
MIL-STD-740 Airborne and Structureborne Noise Mea-
pressures that the inlet and outlet sections of the manifold are
surements and Acceptance Criteria of Shipboard Equip-
required to withstand without damage. Manifold operation is
ment
not required during application of shell test pressure, but the
MS16142 Boss, Gasket Seal Straight Thread Tube Fitting,
manifold must meet all performance requirements after the
Standard Dimensions for
shell test pressure has been removed.
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard
3.1.7 inlet operating pressure range—the range over which
Machinery, Equipment and Systems, Requirements for
the inlet pressure supplied to the manifold can vary under any
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,
operational conditions which the manifold can be subjected to
General Specification for
in service.
2.4 Government Drawings:
3.1.8 internal leakage—leakage from higher pressure to
lower pressure portions of the manifold and which does not
This specification is under the jurisdiction ofASTM Committee F25 on Ships
escape to atmosphere.
and Marine Technology and is under the direct responsibility of Subcommittee
3.1.9 manifold rated pressures—the inlet and outlet pres-
F25.11 on Machinery and Piping Systems.
sure ratings of the manifold.These rated pressures are selected
Current edition approved May 10, 2000. Published August 2000. Originally
from the applicable pressure ratings (see 4.2) and specified in
published as F1685-96. Last previous edition F1685-96.
Annual Book of ASTM Standards, Vol 01.07.
the ordering information (see Section 5). The inlet pressure
Available from American Society of Mechanical Engineers, Headquarters,
ratingisapplicablefromthemanifoldinletuptoandincluding
Three Park Ave., New York, NY 10016–5990. Telephone: 212–591–7722, Fax:
the seats of the outlet stop valve and bypass throttle valve.The
212–591–7674, Telex: 710–591–5267.
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 1685 – 00
FIG. 1 Manifold Configuration
FIG. 2 Manifold Configuration
outlet pressure rating is applicable from the outlet side of the 3.1.15 minimum flow rate demand—the minimum flow rate
seats of the outlet stop valve to the manifold outlet and the demanded of the manifold by the downstream system.
bypass throttle valve to the manifold outlet. 3.1.16 minimum inlet operating pressure—the lowest pres-
3.1.10 manual valves—these are all the manually operated sure supplied to the inlet of the manifold in service.
valves in the manifold which include handwheel-operated 3.1.17 minimum outlet operating pressure—thelowestpres-
valves and wrench-operated valves. The handwheel-operated sureatthemanifoldoutletinservice.Thisisestablishedbythe
valves are the inlet and outlet stop valves, and the bypass accuracy of regulation of the pressure-reducing valve.
throttle valve. The wrench-operated valves are the upstream 3.1.18 minimum set pressure—the lowest set pressure at
anddownstreambleedvalvesandthegageisolationvalve.The which the manifold can meet the performance requirements
requirements for any manually operated valves installed in the specified.
pressure-reducing valve are covered under 6.5.1. 3.1.19 operating pressures—the pressures within the mani-
3.1.11 maximum flow rate demand—the maximum amount fold during service.
of flow demanded of the manifold by the downstream system. 3.1.20 pressure-reducing valve—the component of the
3.1.12 maximum inlet operating pressure—thehighestpres- manifold which accomplishes automatic regulation of the
sure supplied to the inlet of the manifold in service. downstreampressure.Inthiscomponent,theupstreampressure
3.1.13 maximum outlet operating pressure—the highest is reduced to the desired downstream pressure.
pressureatthemanifoldoutletinservice.Thisisestablishedby 3.1.21 pressure-relief valve—the component of the mani-
the accumulation pressure of the pressure-relief valve. fold which protects the manifold and downstream systems
3.1.14 maximum set pressure—the highest set pressure at against downstream over pressurization.
which the manifold can meet the performance requirements 3.1.22 set pressure—the outlet pressure delivered by the
specified. manifold at the time the pressure setting is made. For the
F 1685 – 00
purposes of this specification, it will be assumed that the 5.1.9 Set pressure and set pressure range, if other than
setting is made when there is no flow demand on the manifold specified (see 7.3),
(88lock-up” condition), and the manifold is at surrounding 5.1.10 Flow rate demand range (see 7.1, S1.1.6),
ambient temperature. 5.1.11 Accuracy of regulation required, if other than speci-
3.1.23 set pressure range—the range of set pressures over fied, or if set pressure is below 10 psig (see 7.2),
which the manifold can be adjusted while meeting the perfor- 5.1.12 Relief valve set pressure and accumulation pressure
mance requirements specified. (if different from Specification F1508),
3.1.24 wide open capacity—theflowratewhenavalveisin 5.1.13 Ambient atmospheric conditions: temperature range,
a position which presents the least resistance to flow. chemical contaminants, if any,
5.1.14 Quality of inlet air/nitrogen gas: temperature range,
4. Classification
moisture content, oil/lubricant contaminants, if any,
5.1.15 Special tools required (see 6.7),
4.1 Configuration—Manifolds shall be of the following
5.1.16 Tamper-proof lead seal if required (see Specification
configurations and specified in the ordering information (see
F1795, Section 5),
5.1).
5.1.17 Supplementaryrequirements,ifany(S1throughS4),
Configuration 1-1 One reducer, one relief (see Fig. 1).
and
Configuration 2-1 Two reducers, one relief (see Fig. 2).
5.1.18 Maximumvibrationfrequency,ifotherthanspecified
4.2 Pressure Ratings—Manifolds shall have inlet-rated
(see S1.1.9).
pressures and outlet-rated pressures selected from the follow-
ing categories: 400-, 1500-, 3000-, and 6000-psig (2.8-, 10.3-,
6. Manifold Construction
20.7-, and 41.4-MPa gage pressure). The inlet and outlet
6.1 Manifoldsshallincorporatethedesignfeaturesspecified
pressure ratings selected shall be specified in Section 5.
in 6.2-6.11.
4.3 End Connections—Manifoldsshallhaveinletandoutlet
6.2 Materials of Construction—Material requirements for
end connections selected from those listed in Table 1 and
the assemblies in the manifold shall be as specified in the
specified in Section 5.
applicable component specifications referenced herein. Mate-
rials for all other parts, including the inlet and outlet manifold
5. Ordering Information
blocks, shall be 300 series corrosion-resistant steel (SS304,
5.1 Ordering documentation for manifolds under this speci-
304L, 316, or 316L) or other materials selected to provide
fication shall include the following information, as required, to
weldability and corrosion resistance without requiring paint-
describe the equipment adequately:
ing, coating, or plating. The inlet and outlet manifold blocks
5.1.1 ASTM designation and year of issue,
shallbeweldrepairable.Materialsforcontactingpartsshallbe
5.1.2 Size and type of inlet end connection (see 4.3 and
selected to minimize electrolytic corrosion and galling. Metal-
6.4.2),
lic materials shall conform to applicableASTM specifications.
5.1.3 Size and type of outlet end connection (see 4.3 and
Nonmetallic materials shall be compatible with the line me-
6.4.2),
dium.
5.1.4 Size and type of end connections for pressure-
6.3 General Requirements—Manifoldsshallincorporatethe
reducing valve and pressure-relief valve,
functional elements shown schematically in Fig. 1 or Fig. 2, as
5.1.5 If tail pieces and union nuts are required (when
applicable, and delineated below:
required, their material of construction shall be per Table 1),
(a) Inlet and outlet stop valves,
5.1.6 Manifold configuration, inlet and outlet pressure rat-
(b) Upstream and downstream bleed valves (for depressur-
ings (see 4.1 and 4.2),
ization of all components and fluid cavities.),
5.1.7 Manifold inlet operating pressure range,
(c) Pressure-reducing valve(s),
5.1.8 Type of mounting required: bottom or back mounting
(d) Pressure-relief valve,
(see 6.4.3),
(e) Gauge isolation valve, and
(f) Bypass throttle valve.
TABLE 1 Manifold Inlet and Outlet End Connections Allcomponentsshallbepartofamanifoldassembly,asshown
in Fig. 3 or Fig. 4, as applicable, which requires only one inlet
Type of End Connection Pressure Rating, Applicable
lb/in (MPa) Documents
and one outlet connection to the main flow path of the piping
A
Union , silver-brazed 400 (2.8) MIL-F-1183 (O-ring type) systeminwhichitisinstalled.Theinletandoutletconnections
A
Union , silver-brazed 1500 (10.3) 803-1385946
shallbein-line.Themanifoldshallbefabricatedfrominletand
A
Union , silver-brazed 3000 (20.5) 803-1385943
A outlet blocks, with interconnecting piping for the pressure-
Union , butt/socket 6000 (41.4) 803-1385884
weld
reducing valve(s) and bypass throttle valve flow paths. The
As specified As specified As specified
manual valves shall be cartridge mounted into the inlet and
A
Only the pertinent dimensions listed in the applicable documents applicable to
outlet manifold blocks as shown in Fig. 3 or Fig. 4, as
the straight thread portion of the thread piece shall apply. Thread pieces shall be
applicable.Thepressure-reducingvalveandthepressure-relief
secured to the manifold inlet and outlet blocks using straight threads and a O-ring
seal design. For the manifold inlet and outlet connections, unless otherwise valve shall be mounted by way of takedown connections in
specified in Section 5 the tail pieces and the union nuts shall not be furnished—
accordance with Table 1. The manifold shall be capable of
onlythethreadpiecesshallbefurnished.Iftailpiecesandunionnutsarerequired,
meeting all requirements of this specification and provide
their materials of construction shall be in accordance with the applicable docu-
ments listed above and shall be specified in Section 5. extendedreliableoperationwhenprotectedbya5-µmnominal/
F 1685 – 00
NOTE 1—Pictorial representations are for illustrative purposes only and do not imply design.
FIG. 3 Components of a Manifold Assembly
18-µm absolute filter installed upstream of the manifold inlet 6.4.3 Manifold Mounting—The manifold shall be given
and when subjected to conditions specified in Section 5. structural integrity by means of a subplate provided as part of
6.4 Design Construction Requirements
themanifold.Thesubplateshallbeanangleformtoprovidean
6.4.1 Pressure Envelope—The hydrostatic shell test pres-
accurate mounting surface for both back and bottom mounting
sures shall be 1.5 times the manifold rated inlet and outlet
and shall be bolted to the inlet and outlet manifold blocks in
pressures.
such a way as to not interfere with mounting the manifold to a
6.4.2 Connections—The main-line inlet and outlet connec-
foundation plate. The manifold shall be drilled and tapped or
tions of the manifold, the inlet and outlet connections of the
through-drilled to allow either bottom mounting or back
pressure-reducingvalve(s),theconnectionsforthebypassline,
mounting as specified (see Section 5).All components shall be
and the inlet and outlet connection to the pressure-relief valve
fully and easily accessible for operation, service, or removal
shall be takedown joints (unions or other as specified) as
from the manifold.
specified in Table 1 based on rated pressures specified. Any
6.4.4 Threads—Threads shall be as specified in ASME
exposedthreadsshallbeprotectedbyplasticcapsforshipping.
B1.1. Where necessary, provisions shall be incorporated to
The main-line inlet and outlet connection of the manifold and
prevent the accidental loosening of threaded parts. The design
the inlet and outlet connection for the pressure-reducing
shallbesuchthatstandardwrenchescanbeusedonallexternal
valve(s) shall permit axial adjustment to expedite proper
bolting. Lock wire shall not be used.
installation of the manif
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